CWTS Leiden Datasets

The data science team at the Centre for Science and Technology Studies (CWTS) at Leiden University provides the CWTS Leiden Ranking Open Edition, time-specific versions of OpenAlex, and other resources.

GitHub Repo: https://github.com/CWTSLeiden/CWTS-OpenAlex-databases

Contact: Nees Jan van Eck

leiden_ranking_open_edition_2023

Description

This dataset contains the data used to create the Open Edition of the CWTS Leiden Ranking 2023. The dataset includes (1) data about the universities included in the Leiden Ranking Open Edition 2023 and the links between these universities and their affiliated organizations, (2) data about the publications included in the Leiden Ranking Open Edition 2023 and the links between these publications and universities and main fields, (3) indicators at the level of publications, and (4) indicators at the level of universities and main fields.

The Leiden Ranking Open Edition 2023 is based on the OpenAlex snapshot released on November 21, 2023. The snapshot data is not included in this dataset.

The source code for creating this dataset is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-Leiden-Ranking-Open-Edition

See the following blog post for more information about the Leiden Ranking Open Edition 2023: https://doi.org/10.59350/89wpz-hpz32
Created: Jan 28, 2024 21:20 | Location: EU | View in BigQuery Console

leiden_ranking_open_edition_2024

Description

This dataset contains the data used to create the Open Edition of the CWTS Leiden Ranking 2024. The dataset includes (1) data about the universities included in the Leiden Ranking Open Edition 2024 and the links between these universities and their affiliated organizations, (2) data about the publications included in the Leiden Ranking Open Edition 2024 and the links between these publications and universities and main fields, (3) indicators at the level of publications, and (4) indicators at the level of universities and main fields.

The Leiden Ranking Open Edition 2024 is based on the OpenAlex snapshot released on August 30, 2024. The snapshot data is not included in this dataset.

The source code for creating this dataset is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-Leiden-Ranking-Open-Edition

See the following blog post for more information about the Leiden Ranking Open Edition 2024: https://doi.org/10.59350/r512t-r8h93
Created: Sep 27, 2024 13:07 | Location: EU | View in BigQuery Console

leiden_ranking_open_edition_2025

Description

This dataset contains the data used to create the CWTS Leiden Ranking Open Edition 2025. The dataset includes (1) data about the universities included in the Leiden Ranking Open Edition 2025 and the links between these universities and their affiliated organizations, (2) data about the publications included in the Leiden Ranking Open Edition 2025 and the links between these publications and universities and main fields, (3) indicators at the level of publications, and (4) indicators at the level of universities and main fields.

The Leiden Ranking Open Edition 2025 is based on the OpenAlex snapshot from August, 2025. The snapshot data is not included in this dataset.

The source code for creating this dataset is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-Leiden-Ranking-Open-Edition

See the following blog post for more information about the Leiden Ranking Open Edition 2025: https://doi.org/10.59350/jvjy2-4ww95
Created: Oct 29, 2025 06:05 | Location: EU | View in BigQuery Console

openalex_2023nov

Description

This dataset contains OpenAlex data in a relational format. It is organized into multiple interrelated tables representing key OpenAlex entities such as works, authors, institutions, and sources, along with their relationships.

The dataset is based on the OpenAlex snapshot released on November 21, 2023.

The source code used to construct this dataset is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-OpenAlex-databases
Created: Jan 25, 2024 11:26 | Location: EU | View in BigQuery Console

openalex_2023nov_classification

Description

This dataset contains an algorithmic classification of research publications based on data from OpenAlex. The classification is based on the OpenAlex snapshot released on November 21, 2023.

See the following Zenodo record for more information about the classification: https://doi.org/10.5281/zenodo.10560276
Created: Jan 19, 2024 15:54 | Location: EU | View in BigQuery Console

openalex_2023nov_core

Description

This dataset contains data on core sources and core publications identified in the OpenAlex database (based on the OpenAlex snapshot released on November 21, 2023).

The source code used to identify core sources and core publications in OpenAlex is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-OpenAlex-databases/tree/2023nov

See the following report for more information about the identification of core sources and core publications in OpenAlex: https://doi.org/10.5281/zenodo.10949622
Created: Jan 29, 2024 17:55 | Location: EU | View in BigQuery Console

openalex_2024aug

Description

This dataset contains OpenAlex data in a relational format. It is organized into multiple interrelated tables representing key OpenAlex entities such as works, authors, institutions, and sources, along with their relationships.

The dataset is based on the OpenAlex snapshot released on August 30, 2024.

The source code used to construct this dataset is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-OpenAlex-databases
Created: Sep 24, 2024 14:10 | Location: EU | View in BigQuery Console

openalex_2024aug_core

Description

This dataset contains data on core sources and core publications identified in the OpenAlex database (based on the OpenAlex snapshot released on August 30, 2024).

The source code used to identify core sources and core publications in OpenAlex is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-OpenAlex-databases/tree/2024aug

See the following report for more information about the identification of core sources and core publications in OpenAlex: https://doi.org/10.5281/zenodo.13879947
Created: Sep 24, 2024 14:10 | Location: EU | View in BigQuery Console

openalex_2025aug

Description

This dataset contains OpenAlex data in a relational format. It is organized into multiple interrelated tables representing key OpenAlex entities such as works, authors, institutions, and sources, along with their relationships.

The dataset is based on the OpenAlex snapshot from August, 2025.

The source code used to construct this dataset is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-OpenAlex-databases
Created: Oct 26, 2025 11:29 | Location: EU | View in BigQuery Console

openalex_2025aug_core

Description

This dataset contains data on core sources and core publications identified in the OpenAlex database (based on the OpenAlex snapshot from August 2025).

The source code used to identify core sources and core publications in OpenAlex is available in the following GitHub repository: https://github.com/CWTSLeiden/CWTS-OpenAlex-databases/tree/2025aug

See the following report for more information about the identification of core sources and core publications in OpenAlex: https://doi.org/10.5281/zenodo.17200830
Created: Oct 24, 2025 07:46 | Location: EU | View in BigQuery Console